Just a word...
Under FAA there can be two people P1 hour building in the same aircraft at the same time. It's not allowed under JAA. But it can be the reason some American places are able to offer twin time at incrediby low prices; two people are essentially paying for each hour.
I may be wrong, but for your sake, it's worth checking it out.
Egnatia aviation have DA42's for 215 euro's per hour. Worth a look.